Start with the required result
Choose a DVD workflow according to what must be preserved. A complete folder or ISO keeps the disc structure, menus, and titles. A multi-track MKV can keep a selected title with flexible audio and subtitle tracks. MP4 or another encoded file is better suited to broad playback and sharing.
Inspect the disc before processing
Confirm that you are authorized to copy the disc, then identify the main title, episodic titles, aspect ratio, frame rate, interlacing, audio languages, subtitles, and chapters. Commercial and recordable DVDs can use different structures, so do not assume the longest title is always the correct program.
Avoid unnecessary conversion
Use a structure-preserving or lossless workflow when archive fidelity matters. Transcode only when the destination requires another codec, resolution, or container. A lossy conversion cannot restore missing detail and should not be described as identical to the source.
Verify the backup
Open the finished folder, ISO, MKV, or video file and check the beginning, middle, and end. Confirm picture geometry, audio language, subtitles, chapters, and sync before storing the original disc separately.